You’d never heard of it before I told you,________?

Can you tell me ___ which you based yourcalculation __ detail

CouldI speak to is incharge of International Sales please

Misunderstandingsfrom lack of social communication，unlessproperly，may lead to serious problems．

ent Xi Jinping urged that officials and public figures _________by example and _______ good values among Chinese citizens, especially the younger generation.